DOWNLOAD Sony CPD-G420 (serv.man4) Service Manual ↓ Size: 3.53 MB | Pages: 73 in PDF or view online for FREE

Model
CPD-G420 (serv.man4)
Pages
73
Size
3.53 MB
Type
PDF
Document
Service Manual
Brand
Device
Monitor
File
cpd-g420-sm4.pdf
Date

Sony CPD-G420 (serv.man4) Service Manual ▷ View online

20
Trouble symptoms and remedies
If the problem is caused by the connected computer or other equipment, please refer to the connected equipment’s instruction manual.
Use the self-diagnosis function (page 22) if the following recommendations do not resolve the problem.
Symptom
Check these items
No picture
If the ! (power) indicator is not lit
• Check that the power cord is properly connected.
• Check that the ! (power) switch is in the “on” position.
If the NO SIGNAL message appears 
on the screen, or if the 
! (power) indicator is orange
• Check that the video signal cable is properly connected and all plugs are firmly seated in 
their sockets (page 6).
• Check that the INPUT switch setting is correct (page 9).
• Check that the video input connector’s pins are not bent or pushed in.
xProblems caused by the connected computer or other equipment
• The computer is in power saving mode. Try pressing any key on the keyboard or moving 
the mouse.
• Check that the computer’s power is “on.”
• Check that the graphic board is completely seated in the proper bus slot.
If the OUT OF SCAN RANGE 
message appears on the screen
xProblems caused by the connected computer or other equipment
• Check that the video frequency range is within that specified for the monitor. If you 
replaced an old monitor with this monitor, reconnect the old monitor and adjust the 
frequency range to the following.
Horizontal: 30 – 110 kHz
Vertical: 48 – 170 Hz
If no message is displayed and the 
! (power) indicator is green or 
flashing orange
• Use the Self-diagnosis function (page 22).
If using a Macintosh system
• When connecting to a Power Mac G3/G4 that has 3 rows of pins, check that the supplied 
exclusive Power Mac G3/G4 adapter and the video signal cable are properly connected 
(page 6).
• If you connect to the other version of Macintosh series computer that has 2 rows of pins, 
you will need a different adapter (not supplied).
Picture flickers, bounces, 
oscillates, or is scrambled
• Isolate and eliminate any potential sources of electric or magnetic fields such as other 
monitors, laser printers, fluorescent lighting, televisions, or electric fans.
• Move the monitor away from power lines or place a magnetic shield near the monitor.
• Try plugging the monitor into a different AC outlet, preferably on a different circuit.
• Try turning the monitor 90
° to the left or right.
xProblems caused by the connected computer or other equipment
• Check your graphics board manual for the proper monitor setting.
• Confirm that the graphics mode (VESA, Macintosh 21" Color, etc.) and the frequency of 
the input signal are supported by this monitor (Appendix). Even if the frequency is within 
the proper range, some graphics boards may have a sync pulse that is too narrow for the 
monitor to sync correctly.
• Adjust the computer’s refresh rate (vertical frequency) to obtain the best possible picture.
Picture is fuzzy
• Adjust the contrast and brightness (page 12).
• Degauss the monitor* (page 14).
• Adjust the degree of moire cancellation until the moire is minimal, or set CANCEL 
MOIRE to OFF (page 14).
21
GB
* If a second degauss cycle is needed, allow a minimum interval of 20 minutes for the best result. A humming noise may be heard, but this is not a 
malfunction.
Picture is ghosting
• Eliminate the use of video cable extensions and/or video switch boxes.
• Check that all plugs are firmly seated in their sockets.
Picture is not centered or sized 
properly
• Set the AUTO (
) function to OK (on) in the SIZE/CENTER menu (page 13).
• Adjust the size or centering (page 12). Note that with some input signals and/or graphics 
boards the periphery of the screen is not fully utilized.
Edges of the image are curved
• Adjust the geometry (page 13).
Wavy or elliptical pattern (moire) 
is visible
• Adjust the degree of moire cancellation until the moire is minimal (page 14).
xProblems caused by the connected computer or other equipment
• Change your desktop pattern.
Color is not uniform
• Degauss the monitor* (page 14). If you place equipment that generates a magnetic field, 
such as a speaker, near the monitor, or if you change the direction the monitor faces, color 
may lose uniformity.
White does not look white
• Adjust the color temperature (page 15).
• Check that the 5 BNC connectors are connected in the correct order (page 6).
Letters and lines show red or blue 
shadows at the edges
• Adjust the convergence (page 14).
Monitor buttons do not operate
(
 appears on the screen)
• If the control lock is set to ON, set it to OFF (page 17).
IMAGE RESTORATION function 
does not operate
• Before using this function, the monitor must be in normal operation mode (green power 
indicator on) for at least 30 minutes. For more information on using the IMAGE 
RESTORATION function, see page 17.
• Adjust the computer’s power saving settings to keep the monitor in normal operation 
mode for more than 30 minutes.
• The monitor may gradually lose its ability to perform this function due to the natural aging 
of the picture tube.
USB peripherals do not function
• Check that the appropriate USB connectors are securely connected (page 8).
• Check that the ! (power) switch is in the “on” position. Then reconnect the USB cable to 
the monitor. 
xProblems caused by the connected computer or other equipment
• Check that the power of any self-powered USB compliant peripheral devices is “on.”
• Install the latest version of the device driver on your computer. Contact your device’s 
manufacturer for information about the appropriate device driver.
• If your USB compliant keyboard or mouse does not function, connect them directly to 
your computer, reboot your computer, and make any necessary adjustments to the USB 
settings. Then reconnect the keyboard or mouse to the monitor. If you connect a keyboard 
or mouse to the USB connectors and then boot your computer for the first time, the 
peripheral devices may not function.
A hum is heard right after the 
power is turned on
• This is the sound of the auto-degauss cycle. When the power is turned on, the monitor is 
automatically degaussed for a few seconds.
Symptom
Check these items
 I MAGE
RESTORAT I ON
AVA
A F T E R
WARM UP
LABLE
I
MENU
E
COLOR
X I T :
22
Self-diagnosis function
This monitor is equipped with a self-diagnosis function. If there is 
a problem with your monitor or computer(s), the screen will go 
blank and the ! (power) indicator will either light up green or 
flash orange. If the ! (power) indicator is lit in orange, the 
computer is in power saving mode. Try pressing any key on the 
keyboard or moving the mouse.
If the ! (power) indicator is green
1
Disconnect any plugs from the video input 1 and 2 
connectors, or turn off the connected computer(s).
2
Press the ! (power) button twice to turn the monitor 
off and then on.
3
Hold the control button upward for 2 seconds 
before the monitor enters power saving mode.
If all four color bars appear (white, red, green, blue), the monitor 
is working properly. Reconnect the video input cables and check 
the condition of your computer(s).
If the color bars do not appear, there is a potential monitor failure. 
Inform your authorized Sony dealer of the monitor’s condition. 
If the ! (power) indicator is flashing orange
Press the ! (power) button twice to turn the monitor off 
and then on.
If the ! (power) indicator lights up green, the monitor is working 
properly.
If the ! (power) indicator is still flashing, there is a potential 
monitor failure. Count the number of seconds between orange 
flashes of the ! (power) indicator and inform your authorized 
Sony dealer of the monitor’s condition. Be sure to note the model 
name and serial number of your monitor. Also note the make and 
model of your computer and graphic board.
Specifications
CPD-G420
CRT
0.24 mm aperture grille pitch 
19 inches measured diagonally 
90-degree deflection
FD Trinitron
Viewable image size
Approx. 365 
× 274 mm (w/h) 
(14
3
/
8
  
× 10
7
/
8
 inches) 
18.0" viewing image
Resolution
Maximum
Horizontal: 1920 dots
Vertical: 1440 lines
Recommended
Horizontal: 1280 dots
Vertical: 1024 lines
Input signal levels
Video signal
Analog RGB: 0.700 Vp-p 
(positive), 75 
SYNC signal
H/V separate or composite sync: 
TTL 2 k
Ω, Polarity free
Sync on Green: 0.3 Vp-p 
(negative)
Standard image area
Approx. 352 
× 264 mm (w/h) 
(13
7
/
8
  
× 10
1
/
2
 inches)
or
Approx. 330 
× 264 mm (w/h)
(13 
× 10
1
/
2
 inches)
Deflection frequency*
Horizontal: 30 to 110 kHz
Vertical: 48 to 170 Hz
AC input voltage/current  100 to 240 V, 50 – 60 Hz, 2.0 – 1.0 A
Power consumption
Approx. 130 W (with no USB devices 
connected)
Dimensions
Approx. 451 
× 471 × 461 mm (w/h/d) 
(17
7
/
8
 
× 18
5
/
8
 
× 18
1
/
4
 inches)
Mass
Approx. 25.5 kg (56 lb 3 oz)
Plug and Play
DDC2B/DDC2Bi, GTF**
Supplied accessories
See page 6
* Recommended horizontal and vertical timing condition
• Horizontal sync width duty should be more than 4.8% of 
total horizontal time or 0.8 µs, whichever is larger.
• Horizontal blanking width should be more than 2.3 µsec.
• Vertical blanking width should be more than 450 µsec.
** If the input signal is Generalized Timing Formula (GTF) 
compliant, the GTF feature of the monitor will automatically 
provide an optimal image for the screen.
Design and specifications are subject to change without notice.
INPUT
PICTURE EFFECT
MENU
OK
1
2
! (power) indicator
OK
PRINTING THE SERVICE MANUAL
The PDF of this service manual is not designed to be printed from cover to cover. The pages vary in size, and must therefore be printed in sections 
based on page dimensions. 
NON-SCHEMATIC PAGES
Data that does NOT INCLUDE schematic diagrams are formatted to 8.5 x 11 inches and can be printed on standard letter-size and/or A4-sized paper. 
SCHEMATIC DIAGRAMS
The schematic diagram pages are provided in two ways, full size and tiled.  The full-sized schematic diagrams are formatted on paper sizes between 
8.5” x 11”  and 18” x 30” depending upon each individual diagram size.  Those diagrams that are LARGER than 11” x 17” in full-size mode have been 
tiled for your convience and can be printed on standard 11” x 17” (tabloid-size) paper, and reassembled. 
TO PRINT 
FULL SIZE
 SCHEMATIC DIAGRAMS 
If you have access to a large paper plotter or printer capable of outputting the full-sized diagrams, output as follows:
1) Note the page size(s) of the schematics you want to output as indicated in the middle window at the bottom of the viewing screen.
2) Go to the File menu and select Print Set-up. Choose the printer name and driver for your large format printer.  Con fi rm that the printer settings 
are set to output the indicated page size or larger.
3) Close the Print Set Up screen and return to the File menu. Select “Print...”  Input the page number of the schematic(s) you want to print in the 
print range window.  Choose OK.
TO PRINT
 TILED VERSIO
N OF SCHEMATICS 
Schematic pages that are larger than 11” x 17” full-size are provided in a 11” x 17” printable tiled format near the end of the document. These can be 
printed to tabloid-sized paper and assembled to full-size for easy viewing.
If you have access to a printer capable of outputting the tabloid size (11” x 17”) paper, then output the tiled version of the diagram as follows:
1) Note the page number(s) of the schematics you want to output as indicated in the middle window at the bottom of the viewing screen.
2) Go to the File menu and select Print Set-up. Choose the printer name and driver for your printer.  Con fi rm that the plotter settings are set to output 
11” x 17”, or tabloid size paper in landscape (  
  ) mode.
3) Close the Print Set Up screen and return to the File menu. Select “Print...”  Input the page number of the schematic(s) you want to print in the 
print range window.  Choose OK.
TO PRINT
 SPECIFIC SECTIONS
 OF A SCHEMATIC
To print just a particular section of a PDF, rather than a full page, access the Graphics Select tool in the Acrobat Reader tool bar. 
1) To view the Graphics Select Tool, press and HOLD the mouse button over the Text Select Tool which looks like:                                                                                      
This tool will expand to reveal to additional tools.                                                                                                                                                                                                                                                
Choose the Graphics Select tool by placing the cursor over the button on of the far right that looks like: 
2) After selecting the Graphics Select Tool, place your cursor in the document window and the cursor will change to a plus (+) symbol. Click and 
drag the cursor over the area you want to print. When you release the mouse button, a marquee (or dotted lined box) will be displayed outlining 
the area you selected.
3) With the marquee in place, go to the fi le menu and select the “Print...” option.  When the print window appears, choose the option under the section 
called “Print Range” which says “Selected Graphic”.  
Select OK and the output will print only the area that you outlined with the marquee. 
 
 
 
            (continued 
>)
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